Levothyroxine vs Euthyrox: I had been taking... - Thyroid UK

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Levothyroxine vs Euthyrox

nsygirl profile image
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I had been taking Synthroid for about 8 years. I moved and the doctor I am now seeing put me on Levothyroxine. I had no issues with this, then my last refill was for Euthyrox. After the fifth dose, I got a rash on my ankles. Is it possible that the difference in the fillers that could be causing this?

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nsygirl
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helvella profile image
helvellaAdministratorThyroid UK

Entirely possible.

Provell Euthyrox (and Synthroid, for that matter) are just levothyroxine. And the excipients (ingredients other than active pharmaceutical ingredient(s)) do vary.

I suggest you check carefully through the products you have tried - and see if something sticks out as a possible issue.

My document has links for most (possibly all) USA levothyroxine products which might help.

Remember, many USA products contain colouring agents which vary by dosage. You could find one dosage fine and another causes you issues - despite being exactly the same make. (From memory, I think all Euthyrox is white, isn't it?)

Also, I think Euthryox contains mannitol. There have been issues with at least two medicines in the EU/UK which contain mannitol (Teva and Merck Euthyrox!).

helvella - Thyroid Hormone Medicines

I have created, and try to maintain, a document containing details of all thyroid hormone medicines in the UK and, in less detail, many others around the world.

From Dropbox:

dropbox.com/s/wfhrlmb5983co...

From Google Drive:

drive.google.com/file/d/11z...

nsygirl profile image
nsygirl in reply to helvella

Thank you. Yes, Euthyrox is white. I don't have any food allergies and I haven't changed my diet so I think it must be the Euthyrox.

helvella profile image
helvellaAdministratorThyroid UK in reply to nsygirl

We have seen people who can usually consume products that contain mannitol, or lactose, but when in a levothyroxine medicine have some sort of reaction. It doesn't even start to be clear why this is so.

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